package com.ly.generator.service;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import com.ly.common.constant.Constants;
import com.ly.common.constant.GenConstants;
import com.ly.common.core.text.CharsetKit;
import com.ly.common.exception.CustomException;
import com.ly.common.utils.SecurityUtils;
import com.ly.common.utils.StringUtils;
import com.ly.generator.domain.GenTable;
import com.ly.generator.domain.GenTableColumn;
import com.ly.generator.mapper.GenTableColumnMapper;
import com.ly.generator.mapper.GenTableMapper;
import com.ly.generator.util.GenUtils;
import com.ly.generator.util.VelocityInitializer;
import com.ly.generator.util.VelocityUtils;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import javax.annotation.Resource;

/**
 * 业务 服务层实现
 * @author ruoyi
 */
@Service
public class GenTableServiceImpl implements IGenTableService {
    private static final Logger log = LoggerFactory.getLogger ( GenTableServiceImpl.class );

    @Resource
    private GenTableMapper genTableMapper;

    @Resource
    private GenTableColumnMapper genTableColumnMapper;

    /**
     * 查询业务信息
     * @param id 业务ID
     * @return 业务信息
     */
    @Override
    public GenTable selectGenTableById (Long id) {
        GenTable genTable = genTableMapper.selectGenTableById ( id );
        setTableFromOptions ( genTable );
        return genTable;
    }

    /**
     * 查询业务列表
     * @param genTable 业务信息
     * @return 业务集合
     */
    @Override
    public List<GenTable> selectGenTableList (GenTable genTable) {
        return genTableMapper.selectGenTableList ( genTable );
    }

    /**
     * 查询据库列表
     * @param genTable 业务信息
     * @return 数据库表集合
     */
    @Override
    public List<GenTable> selectDbTableList (GenTable genTable) {
        return genTableMapper.selectDbTableList ( genTable );
    }

    /**
     * 查询据库列表
     * @param tableNames 表名称组
     * @return 数据库表集合
     */
    @Override
    public List<GenTable> selectDbTableListByNames (String[] tableNames) {
        return genTableMapper.selectDbTableListByNames ( tableNames );
    }

    /**
     * 修改业务
     * @param genTable 业务信息
     * @return 结果
     */
    @Override
    @Transactional
    public void updateGenTable (GenTable genTable) {
        String options = JSON.toJSONString ( genTable.getParams () );
        genTable.setOptions ( options );
        int row = genTableMapper.updateGenTable ( genTable );
        if ( row > 0 ) {
            for ( GenTableColumn cenTableColumn : genTable.getColumns () ) {
                genTableColumnMapper.updateGenTableColumn ( cenTableColumn );
            }
        }
    }

    /**
     * 删除业务对象
     * @param tableIds 需要删除的数据ID
     * @return 结果
     */
    @Override
    @Transactional
    public void deleteGenTableByIds (Long[] tableIds) {
        genTableMapper.deleteGenTableByIds ( tableIds );
        genTableColumnMapper.deleteGenTableColumnByIds ( tableIds );
    }

    /**
     * 导入表结构
     * @param tableList 导入表列表
     */
    @Override
    @Transactional
    public void importGenTable (List<GenTable> tableList) {
        String operName = SecurityUtils.getUsername ();
        try {
            for ( GenTable table : tableList ) {
                String tableName = table.getTableName ();
                GenUtils.initTable ( table, operName );
                int row = genTableMapper.insertGenTable ( table );
                if ( row > 0 ) {
                    // 保存列信息
                    List<GenTableColumn> genTableColumns = genTableColumnMapper.selectDbTableColumnsByName ( tableName );
                    for ( GenTableColumn column : genTableColumns ) {
                        GenUtils.initColumnField ( column, table );
                        genTableColumnMapper.insertGenTableColumn ( column );
                    }
                }
            }
        } catch ( Exception e ) {
            throw new CustomException ( "导入失败：" + e.getMessage () );
        }
    }

    /**
     * 预览代码
     * @param tableId 表编号
     * @return 预览数据列表
     */
    @Override
    public Map<String, String> previewCode (Long tableId) {
        Map<String, String> dataMap = new LinkedHashMap<> ();
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableById ( tableId );
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns ();
        setPkColumn ( table, columns );
        VelocityInitializer.initVelocity ();

        VelocityContext context = VelocityUtils.prepareContext ( table );

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList ( table.getTplCategory () );
        for ( String template : templates ) {
            // 渲染模板
            StringWriter sw = new StringWriter ();
            Template tpl = Velocity.getTemplate ( template, Constants.UTF8 );
            tpl.merge ( context, sw );
            dataMap.put ( template, sw.toString () );
        }
        return dataMap;
    }

    /**
     * 生成代码（下载方式）
     * @param tableName 表名称
     * @return 数据
     */
    @Override
    public byte[] downloadCode (String tableName) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream ();
        ZipOutputStream zip = new ZipOutputStream ( outputStream );
        generatorCode ( tableName, zip );
        IOUtils.closeQuietly ( zip );
        return outputStream.toByteArray ();
    }

    /**
     * 生成代码（自定义路径）
     * @param tableName 表名称
     */
    @Override
    public void generatorCode (String tableName) {
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableByName ( tableName );
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns ();
        setPkColumn ( table, columns );

        VelocityInitializer.initVelocity ();

        VelocityContext context = VelocityUtils.prepareContext ( table );

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList ( table.getTplCategory () );
        for ( String template : templates ) {
            if ( ! StringUtils.containsAny ( template, "sql.vm", "api.js.vm", "index.vue.vm", "index-tree.vue.vm" ) ) {
                // 渲染模板
                StringWriter sw = new StringWriter ();
                Template tpl = Velocity.getTemplate ( template, Constants.UTF8 );
                tpl.merge ( context, sw );
                try {
                    String path = getGenPath ( table, template );
                    FileUtils.writeStringToFile ( new File ( path ), sw.toString (), CharsetKit.UTF_8 );
                } catch ( IOException e ) {
                    throw new CustomException ( "渲染模板失败，表名：" + table.getTableName () );
                }
            }
        }
    }

    /**
     * 同步数据库
     * @param tableName 表名称
     */
    @Override
    @Transactional
    public void synchDb (String tableName) {
        GenTable table = genTableMapper.selectGenTableByName ( tableName );
        List<GenTableColumn> tableColumns = table.getColumns ();
        List<String> tableColumnNames = tableColumns.stream ().map ( GenTableColumn :: getColumnName ).collect ( Collectors.toList () );

        List<GenTableColumn> dbTableColumns = genTableColumnMapper.selectDbTableColumnsByName ( tableName );
        List<String> dbTableColumnNames = dbTableColumns.stream ().map ( GenTableColumn :: getColumnName ).collect ( Collectors.toList () );

        dbTableColumns.forEach ( column -> {
            if ( ! tableColumnNames.contains ( column.getColumnName () ) ) {
                GenUtils.initColumnField ( column, table );
                genTableColumnMapper.insertGenTableColumn ( column );
            }
        } );

        List<GenTableColumn> delColumns = tableColumns.stream ().filter ( column -> ! dbTableColumnNames.contains ( column.getColumnName () ) ).collect ( Collectors.toList () );
        if ( StringUtils.isNotEmpty ( delColumns ) ) {
            genTableColumnMapper.deleteGenTableColumns ( delColumns );
        }
    }

    /**
     * 批量生成代码（下载方式）
     * @param tableNames 表数组
     * @return 数据
     */
    @Override
    public byte[] downloadCode (String[] tableNames) {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream ();
        ZipOutputStream zip = new ZipOutputStream ( outputStream );
        for ( String tableName : tableNames ) {
            generatorCode ( tableName, zip );
        }
        IOUtils.closeQuietly ( zip );
        return outputStream.toByteArray ();
    }

    /**
     * 查询表信息并生成代码
     */
    private void generatorCode (String tableName, ZipOutputStream zip) {
        // 查询表信息
        GenTable table = genTableMapper.selectGenTableByName ( tableName );
        // 查询列信息
        List<GenTableColumn> columns = table.getColumns ();
        setPkColumn ( table, columns );

        VelocityInitializer.initVelocity ();

        VelocityContext context = VelocityUtils.prepareContext ( table );

        // 获取模板列表
        List<String> templates = VelocityUtils.getTemplateList ( table.getTplCategory () );
        for ( String template : templates ) {
            // 渲染模板
            StringWriter sw = new StringWriter ();
            Template tpl = Velocity.getTemplate ( template, Constants.UTF8 );
            tpl.merge ( context, sw );
            try {
                // 添加到zip
                zip.putNextEntry ( new ZipEntry ( VelocityUtils.getFileName ( template, table ) ) );
                IOUtils.write ( sw.toString (), zip, Constants.UTF8 );
                IOUtils.closeQuietly ( sw );
                zip.flush ();
                zip.closeEntry ();
            } catch ( IOException e ) {
                log.error ( "渲染模板失败，表名：" + table.getTableName (), e );
            }
        }
    }

    /**
     * 修改保存参数校验
     * @param genTable 业务信息
     */
    @Override
    public void validateEdit (GenTable genTable) {
        if ( GenConstants.TPL_TREE.equals ( genTable.getTplCategory () ) ) {
            String options = JSON.toJSONString ( genTable.getParams () );
            JSONObject paramsObj = JSONObject.parseObject ( options );
            if ( StringUtils.isEmpty ( paramsObj.getString ( GenConstants.TREE_CODE ) ) ) {
                throw new CustomException ( "树编码字段不能为空" );
            } else if ( StringUtils.isEmpty ( paramsObj.getString ( GenConstants.TREE_PARENT_CODE ) ) ) {
                throw new CustomException ( "树父编码字段不能为空" );
            } else if ( StringUtils.isEmpty ( paramsObj.getString ( GenConstants.TREE_NAME ) ) ) {
                throw new CustomException ( "树名称字段不能为空" );
            }
        }
    }

    /**
     * 设置主键列信息
     * @param table   业务表信息
     * @param columns 业务字段列表
     */
    public void setPkColumn (GenTable table, List<GenTableColumn> columns) {
        for ( GenTableColumn column : columns ) {
            if ( column.isPk () ) {
                table.setPkColumn ( column );
                break;
            }
        }
        if ( StringUtils.isNull ( table.getPkColumn () ) ) {
            table.setPkColumn ( columns.get ( 0 ) );
        }
    }

    /**
     * 设置代码生成其他选项值
     * @param genTable 设置后的生成对象
     */
    public void setTableFromOptions (GenTable genTable) {
        JSONObject paramsObj = JSONObject.parseObject ( genTable.getOptions () );
        if ( StringUtils.isNotNull ( paramsObj ) ) {
            String treeCode = paramsObj.getString ( GenConstants.TREE_CODE );
            String treeParentCode = paramsObj.getString ( GenConstants.TREE_PARENT_CODE );
            String treeName = paramsObj.getString ( GenConstants.TREE_NAME );
            String parentMenuId = paramsObj.getString ( GenConstants.PARENT_MENU_ID );
            String parentMenuName = paramsObj.getString ( GenConstants.PARENT_MENU_NAME );

            genTable.setTreeCode ( treeCode );
            genTable.setTreeParentCode ( treeParentCode );
            genTable.setTreeName ( treeName );
            genTable.setParentMenuId ( parentMenuId );
            genTable.setParentMenuName ( parentMenuName );
        }
    }

    /**
     * 获取代码生成地址
     * @param table    业务表信息
     * @param template 模板文件路径
     * @return 生成地址
     */
    public static String getGenPath (GenTable table, String template) {
        String genPath = table.getGenPath ();
        if ( StringUtils.equals ( genPath, "/" ) ) {
            return System.getProperty ( "user.dir" ) + File.separator + "src" + File.separator + VelocityUtils.getFileName ( template, table );
        }
        return genPath + File.separator + VelocityUtils.getFileName ( template, table );
    }
}